Vehicle headlight

Abstract

Optical axes are simultaneously adjusted when a plurality of lighting device units 30, the light sources of which are light emitting elements 34, are tiltably supported by the common unit support member 20. In this case, the positioning recess portion 20 d is provided which is composed so that the light source fixing portion 20 B 1 formed in a plurality of portions of the unit support member 20 can be contacted with the back face 42 a and the outer circumferential face 42 b of the support plate 42 for supporting the light emitting element 34. Due to the foregoing, the light emitting element 34 can be highly accurately attached to the unit support member 20, and the optical axes A x , of the lighting device units 30 can be put in order.

1. A headlight comprising:
 a plurality of lighting device units, wherein each lighting device unit includes a light emitting element and at least one optical member for controlling the light emitted by the light emitting element; 
 a unit support member that supports the plurality of lighting device units, wherein the optical member and the light emitting element of each lighting device unit are individually attached to the unit support member; 
 unit attaching portions provided in a plurality of portions of the unit support member, wherein a component of each lighting device unit is attached to one of the unit attaching portions; 
 a light source fixing portion, for fixing the light emitting element, formed in each unit attaching portion; and 
 a positioning recess portion formed on each light source fixing portion, wherein the positioning recess portion contacts with a back face and an outer circumferential face of a support plate for supporting the light emitting element. 
 
   
   
     2. The headlight according to  claim 1 , wherein a predetermined light distribution pattern is formed when light is irradiated by the plurality of lighting device units. 
   
   
     3. The headlight according to  claim 1 , wherein the unit support member comprises a die-cast product. 
   
   
     4. The headlight according to  claim 1 , wherein the unit support member includes a plurality of radiating fins arranged so that the radiating fins can be exposed to an outer space of the headlight. 
   
   
     5. The headlight according to  claim 1 , wherein the positioning recess portion is formed as a recess groove portion in which the support plate can be slidably inserted into the positioning recess portion. 
   
   
     6. The headlight according to  claim 5 , wherein engaging pieces engaged with the support plate are formed in upper portions on both sides of the positioning recess portion, and the support plate is press-fitted into the positioning recess portion. 
   
   
     7. The headlight according to  claim 1 , wherein the optical member comprises a reflector. 
   
   
     8. The headlight according to  claim 1 , wherein the optical member comprises a projection lens. 
   
   
     9. The headlight according to  claim 1 , wherein the optical member comprises a rectilinear propagation blocking member. 
   
   
     10. The headlight according to  claim 1 , where in the plurality of lighting device units comprise a first lighting device unit, a second lighting device unit and a third lighting device unit,
 wherein the first lighting device unit includes a first projection lens and a first reflector, the first projection lens has a first focal distance, 
 wherein the second lighting device unit includes a second projection lens having a second forcal distance, the second focal distance is longer than the first focal distance, 
 wherein the third lighting device unit includes a third reflector, 
 wherein each reflecting face of the first and the third reflectors is set in such a manner that the each cross section of the reflectors is formed into a substantial elliptical shape and that each eccentricity is gradually increased from the perpendicular cross section to the horizontal cross section, and 
 wherein the eccentricity of the reflecting face of the third reflector is higher than the eccentricity of the reflecting face of the first reflector.